Chances are you've run into this situation. You've built a script, or a one-liner, to perform a specific task, but you don't have a way to thoroughly test it without hitting Enter. That moment before...
Updated Feb 21, 2019
Version 5.0
Blog Post
Just came through another one:
Set-Volume -DriveLetter C -NewFileSystemLabel SYSTEM -WhatIf
There is nothing dangerous here, but the the fact is that the WhatIf parameter is just ignored.